基于TS201系列DSP的PGA算法实现

摘要

The algorithm of phase gradient autofocus (PGA) is widely used in airborne SAR image formation. Because of its complexity and large data size, TS201 DSP with powerful processing capacity is selected to fit for the real-time airborne SAR. In order to make better use of TS201, the algorithm is optimized according to the theories of PGA and the characteristics of TS201 processors, and the most time-consuming FFT procedure is implemented by assembler, which minimizes the data size and the runtime. IDL Simulation and DSP testing system proved this scheme to be feasible for the autofocus of real-time SAR image formation.%相位梯度自聚焦(PGA)算法被广泛用于机载合成孔径雷达(SAR)成像中.由于其过程复杂,数据处理量大,为满足机载SAR实时处理的要求,选用具有强大处理能力的TS201 DSP.为了充分发挥TS201的性能,利用PGA原理和TS201处理器的特点,对算法流程进行优化,并且对最耗时的FFT采用了汇编语言实现,使得运算量和处理时间大大减少.IDL仿真和DSP实测系统验证了该方案可以实现对SAR图像的实时PGA处理.